Feed and traversing motion for lathes



April 3, 192s; 1,665,158

F. R. DEURING FEED AND TRAVERSING MOTION FOR LATI-IES Filed Jan. 14. 1924 3 Sheets-Sheet l F. R. DEURING FEED AND TRAVERSING MOTION FOR LATHES April 3, 192s.

Filed Jan. 14, 1924 s sheets-sheet 2 April 3, 1928.

- 1,665,158 F. R. DEURING FEED AND TRAVERSING MOTIN FOR LATHEs Filed Jan. 14. 1924 3 Sheets-Sheet 3 INV TOR.'

A TTORNEY' Patented Apg, 3 1928..

aras jaar @NME rnnnann rnavnnsnve Morton Fon LA THns.

Appncation sie@ J'aniiafy 14, 1924., serial No. 685.9595, and in Germany 'March 24, 192s.y I y Af known device for, traversing tool holders in capstan lathes, semi-automatic lathes and the like comprises a cam cylinder whose number of revolutions bears a definite e relation to the number of revolutions made by a cam cylinder forming part of the slide feed motion, say 1 :4. With this device the 'cam way for reciprocating the cross slide must be confined to a very smallportion of l0 the cylinder surface, Vand its curvature must be much steeper than that of the feed mo-VV Y l tionof the discsfand tends. to retain them in f anyone of four positions to' which theyfcan y tion cam. The steepness of the cam involves loss of power and may give rise to seizing, so that the cross slide has a jerky 15. motion, which is highly detrimental; Ani other disadvantage of the additional cam vcylinder is that for changing over the traversing motion, from one side to the other,

' considerable time is required.` f Another known method consists in an arrangement by which the turret'V slidey lirn- .parts movement, at intervals, to arack bar ymovingthe cross slide. A rack used for the feed of the turret slide has had fixed to it a Y member embracing a .cylindrical body coupledvwith aV rack for feeding the cross slide, and the cylindrical body is coupled'at 1ntervals with the 'embracing member, but

slides through it when not so coupled. This device works well, but the mechanism is somewhat expensive, and is not quite easy to understand by the ordinary workman..vv

' v Theobject of the invention is to remove these disadvantages. The-invention consists in improved feed motion mechanism, which will be described with reference to examples thereof, shown inthe annexed drawings, the

' distinctive features being pointed out in the 4subjoined claims. Two forms of construction respectivel Fig. 1 is a side view, partlyin section, and Fig. 2 is a cross section on the line arf-b. Fig. 3 is a side view,.partly in section. Fig. 4 is an elevation showing the arrangement of the device in relation to the saddle andthe cross slide. i

Fig. 5 is a side view of a cam device for f '50 reciprocating the turret slide rack, and l Fig. 6 isa cross-section thereof. Referring first to Figs. 1 and 2, 1 designates a reciprocating rack for moving the turret slide, and 2 is a rack in front of it, for moving the cross-slide. A lever 1s pivoted at 5 to the rack 1, and lies within an .are shown in. the drawings, in Figs. 1 and 2 and Ain Fig. 3v

aperture 13 in the rack 2.,' so that it can'move Y with therack 1 unimpeded by the rack 2. The lever has a recess, in which two discs l each having tooth 14', are mounted rotat-v ably on apivot 12. j 'f The two discs 4; arev spaced apart and are connected witheach other'by four pins V6, which are spaced uniformly/around ythe pivot, like thestaves of a lantern wheel. f A'.

spring' 7 xed to lthe lever and.' bearing against these pins imposes restraint on rota- 10, and each time the rack 1moves to the intatte left, as viewed in Fig. 1, one of the pins 6 j strikes this abutment, causing the discs 4to rotate one step. At eachfourthstep theo discsoccupy the position lshownl in Fig. 1,

with the teeth 14 directeddownwards, so,

lthat the lever 3 is lifted. By this' means' 'a tooth 15 of the lever issoplaced that in the course of the followingV movement' of the rack 1 to the right it willstrike an abutment 8 connected to the rack 2. The rack 2 isthus moved. The next movement oftherack 1 v-to the left causes the discs tobe rotated an` other step, so that'the lever?, is dropped again, and put out of action. l The abutment 8` is adjustable on a spindle 9"carried bythe 'rack 2,Y the 'spindle having a screw'threadl engagingthe abutment, so that byfturning it the abutment can be shifted Alengthwise of the rack 2, accor-cling tothe movement which the lrack 'isto receive. I

Fig. 4 shows the application of the pres-y ent Vinvention to a lathe ofknown design.

It Vwill be noted'from this figure thatr'a'ck 2 engages a pinion c at the lower end of a` vertical spindle, which has at 'its upper end*v a pinion f engaging a rack on across slide Z moving between the guides e.y AAfter the rack 2 has been carried to. theright, dueto the engagement of thelever 3 with the abutment 8, upon the next movement of the reciprocating rack 1 to the left, the rounded head a of the lever 3 will engage in the re-l cess b at the left end of the aperture 13,'so`

that the rack y2=is restored to its left endposition. rllhedisk 4 at the same time is ro-V tated another step due to the presence of the abutment 10 so thatV the lever 3 is dropped again and put out of action.

Figs '5 and Gshow the devicel for periodically reciprocating therack l, which in certain cases may also be provided with teeth if it is to be used for moving other parts. Behind the rack 1 is arranged a worm wheel 23 rotatable about the axle 22, the worm wheel being continually rotated by the worm 1- 24. The side of the worm wheel toward the rack 1 is provided with acur'ved track 25.' The rack 1 carries two rollers 26 andl 27 which are alternately engaged by the track V25, and thereby cause displacement of the rack 1 to the right or to theleft.V The rack 1 which lies in front ofthe worm wheel 23 is shown in dottedlines in Fig; 5,'together with the'rollers which it carries. When the worm wheel is rotated inthe direction of the arrow 28,the rollery 26 is 'engaged by the track, and the rack 1 is moved to the left Vuntil the switch member 4 .strikes against the nose 10 and is rotatedv QO thereby. `To- Ward the end of this movementrthel roller 26 has moved through the curved tr-ackto its fbreak,that is, it has move'd-one-half way `is repeated through the track. `Upon further rotation i of the worm wheel the track moves the roller 26 backward so that the rack 1 is returned Y to its Vinitial position. When the worm wheel rotates further the track comes into engagement with roller 27 and the above movement forward `and backward twice. Y

- n themodification shown in .3 the rack l', carries "on avpivotj12 a ratchet wheel fl4 havingcircular series of holes 16,A into wwhich pins` or studs'1'7 can be inserted, say

four studs, asshown, orany other number upto the number of holes provided.V The rack 2 carries al pawl 10 engaging the ratchet wheel. 'AV lever 3 is pivote'd at 5 y toithe rackV 1. vThe left hand arm of this lever, as viewed in Fig. 3, is weighted so that it tends to lift a projection 19 on the .other arm` into thepath vof. the studs 17.

Y When one of the studs 17 strikes the part 19,

the right hand arm of the Ilever is depressed.

When it has been depressed, as shownin the drawing, and the 'rack l movesin the ldirec- During onel rotation of the, -worm wheel therefore, the rack is moved tion of the arrow 20 the lever strikes an a'djustable abutment 8 onk the rack 2 and-v ymoves the latter.

When the rack 1 moves in the direction of the arr'owl21 the ratchet wheel 4 strikes the `pawl 10 and is rotated one step', so that the `stud 17 which was resting on the part 19 is removed therefrom, and the weighted arm of the lever is allowed to -drop on the bottom edge ofthe aperture 13 in thenrack 2. When jthe rack V1 is ap- Y preaching the yend of its lleftward movement Y thelever 3 strikes the adjacent upright edge 'of the aperture 13 and moves the rack 2 back Y to its former position. The following movements of the rack 1 will not'cause movement 'of the rack 2 until after the next stud 17 has depressed the lever 3f again. 'Y l It will be understood that the mechanism 'shown can be modified in detail in many re spects without departing from the principle of the invention. Vhat I claim is: p 1. Feed motion mechanism for lathes having turret slides and cross slides, comprising two reciproeable racks for moving vthe turret.

slide and the cross slide respectively, means for reciprocating saidturret slide racla,` a catch pivoted to one of saidracks, an abutment carried by the other rack, a member c'laim 1, wherein the pivoted catchrisV a lever g Y `pivoted to the turret slide rack and disposed within an aperture in the cross-slide rack,

lever and being rotated stepwise Vby striking a'n abutment within'sai'd aperture.

The foregoing specification signed at (lo-` logne, Germany, this 19th lday of November.

FRITZ RroHARn DEURING.

e5 Y the rotatable member being pivoted tosa'id 

